Yamaha recommends the Yamaha PA-3B AC Adaptor for the Yamaha QY70 power supply.
The Yamaha PA-3B AC Adaptor has a rated voltage of DC 10-12V, and a rated current of 700mA (zZounds Music 2006).
Living in Norway, I have been using the following adaptor for years — still working like a charm:
Nordic Power AB
AC Adaptor
Model A31260G
Output: 12VDC 600mA
Input: 230VAC ~ 50Hz
Replacing the 3V SONY CR2032 lithium backup battery on the Yamaha QY70 is easy. I replaced mine with a VARTA CR2032 lithium battery. I just removed the back cover, removed the battery from the socket and replaced it.
Press the battery towards the visible springs and lift up the battery. Very little force is needed. Avoid short-circuiting the new battery with your fingers, preferably use tweezers made of plastic. Whatever you do, do not attempt to move, remove or open the black plastic ring! Leave the black plastic ring alone!
Luckily, the battery had not leaked before I replaced it..., and the new one should probably be good for another 4 years.
